“〜koto ka”: How 〜 It Was! (strong exclamation) [JLPT N2]

Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026

“How worried I was!” “How many times did I warn you!” — used for strong exclamation of deep feeling

「どんなに心配したことか」 — not a question, but the whole feeling cried out

「あなたが無事に帰ってきて、どんなに安心したことか」 (you came back safe — how relieved I was!) — 「〜ことか」 isn't asking a question, but a strong exclamation: “how ～!,” used to pour out a deep feeling (joy, hardship, worry, gratitude, regret…). It often echoes 「どんなに・どれほど・何と」. This guide covers 「ことか」's use and attachment, separating it from 「ことだ・ものだ」 (N2).

Core: how ～! (a strong exclamation pouring out a deep feeling)

「(plain form) ＋ ことか」 = “how ～!” — pouring out a deeply-felt personal emotion in the form of an exclamation:

• どんなに、この日を待っていたことか (how I've waited for this day!).
• あの時、どれほど心細かったことか (back then, how anxious I was!).

Feel: “how …!” — the core is “pouring out a strong feeling in an exclamatory tone”: not plainly saying “I was worried,” but crying out the whole feeling with “どんなに心配したことか (how worried I was!).” Often echoed by どんなに・どれほど・何度・何と. Usable in writing and speech.

Attachment & echoing words

Examples in context

• 試験に落ちて、どれほど悔しかったことか。(Failing the exam, how mortified I was!)
• 子供の頃、どんなにこの公園で遊んだことか。(As a child, how much I played in this park!)
• 一人で育てるのが、どんなに大変だったことか。(Raising them alone, how hard it was!)
• あなたに会えて、どれほど嬉しいことか。(Getting to meet you, how happy I am!)
• 何度、あきらめようと思ったことか。(How many times I thought of giving up!)

⚠️ Common mistakes to avoid

① 「ことか」 is an exclamation, not a question — no answer needed. Though 「か」 looks like a question, 「〜ことか」 isn't asking — it's an exclamation (how …!), needing and getting no answer. どんなに心配したことか = how worried I was! (pouring out feeling), not asking “how much did you worry?” Don't treat it as a real question to answer. Its 「か」 is an exclamatory ending, with a “beyond words, indescribable” lingering.

② na-adjectives・nouns add 「な」 — don't drop it. Verbs, i-adjectives attach the plain form directly (待ったことか, 嬉しかったことか); but na-adjectives add 「な」: 大変なことか (○ how hard!), 幸せなことか (○). Without a sense of adjective conjugation, it's easy to drop the 「な」 as 「大変ことか」 (×). Always add 「な」 for na-adjectives.

③ Often echoed by 「どんなに・どれほど・何と」. 「ことか」 is rarely used alone; it's almost always preceded by an echoing adverb to heighten the exclamation's degree: どんなに〜ことか／どれほど〜ことか (how …!), 何度〜ことか (how many times!), 何と〜ことか (how …!, written). Without the echoing word, the exclamation's force is much weaker. When writing, remember to put 「どんなに・どれほど」 etc. in front.

🔄 Compare with similar forms: ことか／ことだ／ものだ／ことだろう

💡 The one thing to remember

「〜ことか」 = how ～!, its core “pouring out a deeply-felt personal emotion (joy, hardship, worry, gratitude, regret) in the form of an exclamation” (どんなに心配したことか = how worried I was!; どれほど嬉しいことか = how happy I am!). Three points: ① it's an exclamation, not a question — no answer needed, the 「か」 is an exclamatory ending; ② na-adjectives・nouns add 「な」 (大変なことか, don't drop it); ③ often echoed by 「どんなに・どれほど・何と」 to heighten the exclamation. There's also the written variant 「何と〜ことか」. Separate it from 「ことだ (advice)」「たものだ (nostalgia)」「ことだろう (conjectural exclamation)」. To vividly pour out the strong feeling “(that emotion) is beyond words,” ことか is the most vivid.

❓ Common questions

Q: 「ことか」 has 「か」 — is it a question? Do I answer it?

It's not a real question; no answer needed. Though 「〜ことか」 ends in 「か」, it's an exclamatory sentence, not asking. It means “how ～!,” used to pour out, emphasize one's deep feeling, not to ask the other something. E.g., 「どんなに嬉しかったことか」 = “how happy I was!” — expressing the exclamation “happy beyond words,” not asking “how happy were you?” So on hearing 「〜ことか」, you needn't (and can't) answer “how much.” Its 「か」 here is an exclamatory ending, with a “(that degree) is beyond telling, indescribable” lingering, making the emotional outpouring more forceful and moving. This “using a question form for a strong exclamation” is common in Japanese (e.g., 「なんてことだ！」 is also an exclamation, not a question). Test: see 「どんなに／どれほど ＋ 〜ことか」 and you know it's the exclamation ‘how …!,' not a question. It's often used to recall and pour out past deep feelings (hardship, worry, longing), full of emotion.

Q: 「ことか」「ことだ」「ものだ」 all use 「こと／もの」 — how do I tell them apart?

The three differ in use, told apart by feel and pairing:

① 〜ことか = how ～! (a strong, personal exclamation, pouring out deep feeling, often echoed by どんなに/どれほど): どれほど苦労したことか (how much I suffered! — pouring out one's own hardship). The point is “strongly pouring out one's own emotion.”

② 〜ことだ = ① you should ～ (advice) ② it really is ～ (a mild sigh about a matter): ① 健康のためには、早く寝ることだ (for your health, you should sleep early — advice); ② 困ったことだ (what a bother — a mild sigh). The advice use ① is commonest, attaching to a verb dictionary form, meaning “(you) should ….”

③ 〜ものだ = a sigh/nature/nostalgia (especially ‘verb た-form ＋ ものだ' for nostalgia): 子供の頃、よくここで遊んだものだ (as a child, I used to play here a lot — nostalgia); 人生とは難しいものだ (life really is hard — a sigh about its nature). 「たものだ」 means “(back then) used to … (nostalgia).”

Trick: strongly pour out your own feeling (how …!) → ことか; give advice (should …) → ことだ; nostalgia (used to …) or nature/sigh → (た)ものだ. E.g., 「どんなに感謝したことか」 = how grateful I was! (exclamation); 「感謝することだ」 = you should be grateful (advice); 「昔はよく感謝されたものだ」 = I used to be thanked a lot (nostalgia). The three — one lyrical exclamation, one advice, one nostalgia/sigh — differ in tone and use.

🖊️ Practice Questions (5)

Q1. 「この日を___待っていたことか。」（how (I) longed for this day!）

(A) どんなに　(B) どうして　(C) どこで　(D) どれ

Q2. 「何度注意した___。」（how many times (I) warned (them)! — an exclamation）

(A) ことか　(B) ことだ　(C) ものか　(D) はずだ

Q3. 「どんなに心配したことか」の意味は?

(A) How worried (I) was! (a strong exclamation)

(B) Not worried at all

(C) Asking whether (someone) is worried

(D) Ordering (someone) not to worry

Q4. 「ことか」とよく呼応するのは?

(A) どんなに・何度・どれほど (interrogatives)

(B) たぶん

(C) もし

(D) ぜひ

Q5. 用法が自然なのは?

(A) どれほど苦労したことか。　(B) ことか心配した。

(C) 行くことか。　(D) 高いことかだ。

Answer Explanations

1. (A) どんなに ── How (I) longed for it (どんなに〜ことか).

2. (A) ことか ── How many times (I) warned (them)! (exclamation).

3. (A) ── How worried (I) was! (exclamation).

4. (A) ── Often paired with どんなに/何度/どれほど.

5. (A) ── 「どれほど苦労したことか」 is correct.